Why is my body behaving like that?

So we had a wedding dinner on Saturday. After the dinner, the whole lot of us (Nick's Friends) headed out to hang out.

I had a glass of wine then we went down to Selegie for tau huey before we headed back in Eugenia's car.

On the way back, I felt REALLLY unwell.
Feeling nauseous and my head begin to spin, I nearly asked them to stop so that I would ... probably try to throw up.

But I held it back and I begin to perspire crazily. If there's one thing about me not many people would know, that is I don't perspire easily. Even when its hot! That is also probably why I don't mind the hot weather.

So anyways, I felt unwell and then I perspire so much I wet the chair. (Sorry Eugenia!!)

After which, I felt a lill better. No nauseousness and only with a slight headache.

When Nick walked me up, I could still share with him that I felt unwell earlier on but felt better then.

Oh boy, when I got home again I feel so unwell that no longer do I feel like throwing up, I felt like I was gonna black out.

Showered with wobbly legs and without toweling myself dry, I changed and lay on my bed.

Only then I felt much better.

Why like that ah?

I am fairly certain it is not the wine for I know although I don't drink often, my alcohol tolerance level would not limit to a glass of wine! Me is not Gek.

Then what caused my sick feeling?